quick1racer

i had a b20 vtec installed turbo it will not start.
only electronics i changed was i converted to a gm 3 bar map sensor.
no check engine lights
i turn it over it will sound like it is going to start up and then sputter and die
fuel pressure is fine
help any advice.

Jared

You can't use a 3 bar map sensor with a stock computer.

quick1racer

sorry i forgot to say i have a apex vafc does that help any

DOHCarp

you can run a 3 bar with a v-afc just make sure you have it adjusted accordingly with what injectors you have. also make sure on the v-afc you have the right in and out settings.

also sounds stupid but check your fireing order.

quick1racer

i am running skunk 2 stage 2 cams for NA could that effect anything.
i have not even started the car with them could they cause the car not to start

Mr. Softee

no, that wont affect anything. what size injectors do you have

quick1racer

old school h22 i think they are around 310cc

Mr. Softee

stock injectors just a 3 bar map sensor added hmmm. You aren't richening up, if anything you are leaning out from the 3 bar's voltage manipulation. Try adding fuel in increments of 5% below 2000 rpm on the low cam map and see if that starts it. Stop when you get to like 40%.

Mr. Softee

Also have you tried giving it gas when you start it to see if it will at least spin through the rpms a little?

quick1racer

thanks you were right the injectors were the problem
i converted back to the honda MAP
looking for some dsm injectors 450cc to convert back to 3 BAR MAP
thanks for the help

platinum00

you can run a 3 bar with stock injectors. the map sensor does nothing but give voltage , as long as you have the ecu calabrated right it will be fine

if you using a afc, the stock setting are 6 in and 6 out. i think with a 3 bar it's like 4 in and 4 out, im not for sure. do a search for afc 3 bar or something

platinum.

quick1racer

i will try see what happens

Mr. Softee

Yea you can run stock injectors with the 3 bar you just have to know how the voltage division works. You also need an FMU.

quick1racer

i tried it out it was 6 in 4 out with h22 injectors on the vafc
i have a vortech fmu will that work??? why do i need the fmu
if i upgrade to dsm 450 cc injectors do i still need the fmu

Mr. Softee

Inlinepro would say Yes.
I would say get motec